Supercritical mixing ejection mechanism

Abstract

The utility model discloses a supercritical mixing injection mechanism, which relates to the technical field of injection molding and comprises an elbow, a material blocking oil cylinder is fixedly mounted at the top end of the elbow, an injection barrel is fixedly mounted at one end of the outer surface of the elbow, and a feeding mechanism for uniformly mixing supercritical fluid and polymer plastic materials is arranged in the injection barrel. An ejection mechanism is arranged in the storage barrel; and a feeding mechanism is arranged between the injection barrel and the baffle folded plate. According to the supercritical mixing injection molding equipment, a V-shaped injection structure is adopted, feeding and injection are not coaxial, a polymer plastic material is conveyed forwards along with rotation of the screw and is heated and melted in the conveying process, supercritical fluid enters the injection barrel through the one-way air nozzle, and the supercritical fluid and the polymer plastic material are fully mixed and smelted under rotation of a special structure of the screw; and after the material quantity measured by the electronic measuring ruler is reached, the material is ejected into the mold, so that the physical foaming is uniform, and the yield is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically a supercritical mixing injection mechanism. Background Technology

[0002] The molding of foamed plastics generally involves feeding plastic and gas into a feeding pipe equipped with a screw. The feeding pipe is equipped with a heating device, which melts the plastic. Under the stirring of the screw, the molten plastic and gas are fully mixed to form a plastic solution containing air bubbles. The solution is output from the front end of the feeding pipe, passes through a mold, and is cooled and solidified.

[0003] However, existing injection mechanisms require the screw to rotate continuously at a constant speed, and a uniform pressure must be maintained in the feed tube; otherwise, the dissolution of air bubbles in the plastic will be uneven or they will expand.

[0004] To address the aforementioned deficiencies, Chinese Patent Publication No. CN218948255U discloses a vertical injection mechanism for supercritical foaming molding, comprising a mixing device, a metering device connected to the mixing device, and a mold for outputting molding material from the metering device. The metering device includes a metering cylinder with an internal metering space, a pusher that ejects the molding material from the metering cylinder, and a metering space inside the metering cylinder for loading the output molding material. It also includes a connecting channel connected to the mold and outputting the molding material into the mold. The connecting channel is designed perpendicular to the mold and is linearly arranged from the metering space to the molding groove. This design allows the connecting channel to linearly transport the molding material into the mold, enabling smoother and more precise metering, thereby effectively improving molding quality.

[0005] The device described above utilizes a vertical mold design during use, which facilitates precise quantitative feeding. However, when the screw feeds material, the mixing end will leave the air inlet, resulting in the next feeding containing a section of material that has not been mixed with the air, leading to uneven foaming and affecting the yield. Utility Model Content

[0006] The purpose of this invention is to provide a supercritical mixing injection mechanism to solve the problem of uneven foaming in the equipment mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a supercritical mixing injection mechanism, comprising an elbow, a material blocking cylinder fixedly installed at the top of the elbow, an injection cylinder fixedly installed at one end of the outer surface of the elbow, and a feeding mechanism for uniformly mixing supercritical fluid with polymer plastic material provided inside the injection cylinder; a storage cylinder fixedly installed at the other end, and a storage space and an injection mechanism provided inside the storage cylinder; a cover fixedly installed on the inner side of the elbow, and a feeding mechanism provided between the injection cylinder and the material blocking baffle.

[0008] Furthermore, the feeding mechanism includes a hopper, which is fixedly mounted on a mounting base, and the upper surface of the mounting base is provided with a sliding groove. The baffle plate is fixedly mounted in the sliding groove of the mounting base, and the baffle plate and the mounting base can slide relative to each other through the sliding groove.

[0009] Furthermore, a power assembly is fixedly mounted on the inner side of the mounting base, a screw is rotatably mounted on the outer surface of the power assembly, and a screw head is fixedly mounted on the outer surface of the screw.

[0010] Furthermore, the screw is movably mounted on the inner side of the injection barrel, and a one-way air nozzle is fixedly mounted on the outer side of the injection barrel, while a screw head is movably mounted on the inner side of the injection barrel.

[0011] Furthermore, a storage cylinder is fixedly installed on the outer surface of the elbow, a heating ring is fixedly installed on the outer surface of the storage cylinder, a storage seat is fixedly installed on the outer surface of the storage cylinder, and a material injection cylinder is fixedly installed on the outer surface of the storage seat.

[0012] Furthermore, the injection mechanism includes an electronic measuring scale, which is movably mounted on the outer surface of the injection cylinder. An injection piston rod is movably mounted on the outer surface of the injection cylinder. A sealing disc is fixedly mounted on the outer surface of the injection piston rod. An injection head is fixedly mounted on the outer surface of the injection piston rod.

[0013] Furthermore, a material blocking needle is movably mounted on the outer surface of the material blocking cylinder, the material blocking needle is movably mounted on the inner side of the elbow, a receiving cavity is opened on the inner side of the elbow, a bushing is fixedly mounted on the inner side of the elbow, and a nozzle is fixedly mounted on the outer surface of the bushing.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) Supercritical fluid is introduced through a one-way air nozzle, which promotes full mixing of the polymer plastic material with the special structure of the screw under the rotation of the screw, thereby improving the foaming quality of the product;

[0016] (2) As the screw rotates, the polymer plastic material is transported forward and melted by heat during the transport process. At the same time, the supercritical fluid enters the injection barrel through the one-way air nozzle and mixes and melts with the polymer plastic material under the rotation of the screw's special structure. The mixture is then stored in the storage barrel. After the material reaches the amount measured by the electronic measuring ruler, it is injected into the mold, resulting in uniform physical foaming and improved yield.

[0017] (3) The mixture is pushed forward by the injection head through the receiving cavity inside the elbow, and then stored in the storage cylinder. After reaching the specified amount of material, the power component is turned off, and the material blocking cylinder drives the material blocking needle to retract. The injection cylinder injects the mixture into the mold through the injection nozzle. When the mixture enters the mold, it is subjected to instantaneous changes in temperature and pressure. The supercritical fluid in it will immediately turn into a gaseous state, thereby pushing the mixture to fill the mold instantly.

[0018] (4) The mechanism adopts a V-shaped injection design, with the feed and injection axes being different, which avoids a section of polymer plastic material that is not fused with the supercritical fluid during injection, thus improving the yield rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of the mounting base of this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the injection cylinder of this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the material storage seat of this utility model;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the heating ring of this utility model;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the screw of this utility model.

[0025] In the diagram: 1. Elbow; 2. Material blocking cylinder; 3. Injection cylinder; 4. Material blocking baffle; 5. Hopper; 6. Mounting base; 7. Power assembly; 8. Receiving cavity; 9. Heating ring; 10. Storage cylinder; 11. Storage seat; 12. Injection cylinder; 13. Electronic measuring scale; 14. One-way air nozzle; 15. Screw; 16. Screw head; 17. Seal; 18. Bushing; 19. Injection head; 20. Sealing disc; 21. Injection piston rod; 22. Material blocking needle; 23. Injection nozzle. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: Please refer to Figure 1 - Figure 6 The present invention provides the following technical solution: a supercritical mixing injection mechanism, including an elbow 1, a material blocking cylinder 2 fixedly installed at the top of the elbow 1, an injection cylinder 3 fixedly installed at one end of the outer surface of the elbow 1, and a feeding mechanism for uniformly mixing supercritical fluid with polymer plastic material is provided inside the injection cylinder 3; a storage cylinder 10 is fixedly installed at the other end, and a storage space and an injection mechanism are provided inside the storage cylinder 10; a cover 17 is fixedly installed on the inner side of the elbow 1, and a feeding mechanism is provided between the injection cylinder 3 and the baffle plate 4.

[0028] The feeding mechanism inside the injection cylinder 3 ensures uniform mixing of supercritical fluid and polymer plastic material, thereby improving the foaming and molding quality of the product. The injection mechanism inside the storage cylinder 10 facilitates rapid filling of the mold with the mixture, increasing the yield. Furthermore, the baffle plate 4 facilitates switching between different polymer plastic materials, thereby improving work efficiency.

[0029] Example 2: Based on Example 1, please refer to... Figure 1 - Figure 6 The material injection cylinder 3 is also disclosed, and its specific structure is as follows: the feeding mechanism includes a hopper 5, which is fixedly installed on the mounting base 6, and the upper surface of the mounting base 6 is provided with a sliding groove. The baffle plate 4 is fixedly installed in the sliding groove of the mounting base 6, and the baffle plate 4 and the mounting base 6 can slide relative to each other through the sliding groove. The inner side of the mounting base 6 is fixedly installed with a power component 7, and the outer surface of the power component 7 is rotatably installed with a screw 15. The outer surface of the screw 15 is fixedly installed with a screw head 16. The screw 15 is movably installed on the inner side of the material injection cylinder 3, and the outer side of the material injection cylinder 3 is fixedly installed with a one-way air nozzle 14. The inner side of the material injection cylinder 3 is movably installed with a screw head 16.

[0030] By placing the polymer plastic material into the hopper 5, and installing heating rings 9 on both the storage cylinder 10 and the injection cylinder 3, the temperature of the injection cylinder 3 rises under the heating of the heating rings 9. After setting the measurement parameters of the electronic measuring ruler 13, the power is turned on, and the power assembly 7 is started. The power assembly 7 drives the screw 15 to rotate, so that the polymer plastic material is transported forward with the rotation of the screw 15. During the transport process, it is heated and melted, improving the processing efficiency. Supercritical fluid is introduced through the one-way air nozzle 14, so that it is fully mixed with the polymer plastic material under the rotation of the special structure of the screw 15, thereby improving the quality of the processing and molding.

[0031] Example 3: Based on Example 1, please refer to... Figure 1 - Figure 6 The paper also discloses an injection piston rod 21, the specific structure of which is as follows: a storage cylinder 10 is fixedly installed on the outer surface of the elbow 1, a heating ring 9 is fixedly installed on the outer surface of the storage cylinder 10, a storage seat 11 is fixedly installed on the outer surface of the storage cylinder 10, and an injection cylinder 12 is fixedly installed on the outer surface of the storage seat 11. The injection mechanism includes an electronic measuring scale 13, which is movably installed on the outer surface of the injection cylinder 12. An injection piston rod 21 is movably installed on the outer surface of the injection cylinder 12, a sealing disc 20 is fixedly installed on the outer surface of the injection piston rod 21, an injection head 19 is fixedly installed on the outer surface of the injection piston rod 21, a blocking needle 22 is movably installed on the outer surface of the blocking cylinder 2, and the blocking needle 22 is movably installed on the inner side of the elbow 1. A receiving cavity 8 is opened on the inner side of the elbow 1, a bushing 18 is fixedly installed on the inner side of the elbow 1, and an injection nozzle 23 is fixedly installed on the outer surface of the bushing 18.

[0032] The mixture is pushed forward by the injection head 19 through the receiving cavity 8 inside the elbow 1, and then stored inside the storage cylinder 10. After reaching the specified material volume, the power component 7 is turned off, and the material blocking cylinder 2 drives the material blocking needle 22 to retract. The injection cylinder 12 injects the mixture into the mold through the injection nozzle 23. When the mixture enters the mold, it is subjected to instantaneous changes in temperature and pressure. The supercritical fluid in it will immediately turn into a gaseous state, thereby pushing the mixture to instantly fill the mold. In addition, the equipment adopts a V-shaped injection design, with the feeding and injection axes being different, which facilitates the full mixing of polymer plastic materials and improves the yield.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A supercritical mixing injection mechanism, comprising an elbow (1), wherein a material-blocking cylinder (2) is fixedly installed at the top end of the elbow (1), characterized in that: One end of the outer surface of the elbow (1) is fixedly installed with a material injection cylinder (3), and the material injection cylinder (3) is provided with a feeding mechanism to make the supercritical fluid and the polymer plastic material mix evenly; the other end is fixedly installed with a storage cylinder (10), and the storage cylinder (10) is provided with a storage space and an injection mechanism. A cover (17) is fixedly installed on the inner side of the elbow (1), and a feeding mechanism is provided between the injection cylinder (3) and the baffle plate (4).

2. The supercritical mixing injection mechanism according to claim 1, characterized in that: The feeding mechanism includes a hopper (5), which is fixedly installed on a mounting base (6). The upper surface of the mounting base (6) is provided with a sliding groove. The baffle plate (4) is fixedly installed in the sliding groove of the mounting base (6), and the baffle plate (4) and the mounting base (6) can slide relative to each other through the sliding groove.

3. The supercritical mixing injection mechanism according to claim 2, characterized in that: A power assembly (7) is fixedly installed on the inner side of the mounting base (6), and a screw (15) is rotatably installed on the outer surface of the power assembly (7), and a screw head (16) is fixedly installed on the outer surface of the screw (15).

4. The supercritical mixing injection mechanism according to claim 3, characterized in that: The screw (15) is movably installed on the inner side of the injection cylinder (3), and a one-way air nozzle (14) is fixedly installed on the outer side of the injection cylinder (3), and a screw head (16) is movably installed on the inner side of the injection cylinder (3).

5. A supercritical mixing injection mechanism according to claim 1, characterized in that: A storage cylinder (10) is fixedly installed on the outer surface of the elbow (1), a heating ring (9) is fixedly installed on the outer surface of the storage cylinder (10), a storage seat (11) is fixedly installed on the outer surface of the storage cylinder (10), and a material injection cylinder (12) is fixedly installed on the outer surface of the storage seat (11).

6. The supercritical mixing injection mechanism according to claim 1, characterized in that: The injection mechanism includes an electronic measuring scale (13), which is movably mounted on the outer surface of the injection cylinder (12). An injection piston rod (21) is movably mounted on the outer surface of the injection cylinder (12). A sealing disc (20) is fixedly mounted on the outer surface of the injection piston rod (21). An injection head (19) is fixedly mounted on the outer surface of the injection piston rod (21).

7. The supercritical mixing injection mechanism according to claim 1, characterized in that: The outer surface of the material blocking cylinder (2) is movably mounted with a material blocking needle (22), the material blocking needle (22) is movably mounted on the inner side of the elbow (1), the inner side of the elbow (1) is provided with a receiving cavity (8), the inner side of the elbow (1) is fixedly mounted with a bushing (18), and the outer surface of the bushing (18) is fixedly mounted with a nozzle (23).

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